I can't quickly silence my phone by holding the # key down like I could on my previous razor. Because that doesn't work, I can never quickly silence my phone without making the noises that come when I turn the phone off or when I use the buttons on the side to silence. Is there any way to address this?

No, this is a design flaw of the early Razr phones. The only way to silence then is to step down the volume, which makes noise at every step. A truly inexcusable oversight, and one of the reasons I ultimately gave up that phone.
When I was in a place where I had to mute the phone without making noise, the only option was to power it off.
I understand that you can, with the cover closed, scroll to and select the silent profile, and press the lone button to activate the silent profile, but I no longer have a RAZR to test that.

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On page 20 in the manual, it suggests that it might be in silence mode, so to toggle between the two, in Idle Mode, press and hold down the [#] key. If that doesn't work, than try increasing your ringtone's volume, in Idle Mode, push the volume key up to increase the volume.

To activate SilenceAll:
Press and hold the volume key (on the side of your phone) down in standby mode.While holding the phone this can be accidentally be pushed & set.
(The screen will display "SilenceAll.") To deactivate SilenceAll:
Press the volume key (on the side of your phone) up repeatedly to select a desired volume level.

1. Make sure that the "Smart Profile: Face Down" feature is enabled.2. Hold the phone face up in your palm.3. Call your Droid X from another phone.4. As the phone is vibrating, DO NOT ANSWER.5. Still holding the phone, flip the phone face down as it vibrates.6. Still holding it face down, hit your volume key to silence the phone.7. Flip the phone back over so it's face up. You should feel a quick vibrating jolt indicating the ringer is back on.8. End the call. It shouldn't matter which phone you end the call from, as feeling the jolt is the key.9. Leave phone face up and call yourself again. If the ringer is now working again, turn OFF "Smart Profile: Face Down" until there's a true fix.10. If it does not work initially, try all of the steps again a few more times and hope you get lucky.

Explorer Series: 220,320, 330, 340, 350
Begin with the headset
turned off. Press and hold down the silver call control button in for
6-10 seconds. The light will flash blue first. Continue to hold the
button down then release the button when the indicator light starts
flashing red then blue.

The # key is pressed for 2 seconds to switch your phone from Silent to General profiles. But it seems that on the software version v5 it's disabled. type this to check your version *#0000#
The solution:
Try to "downdate" back to version 4.71 or pressurise Nokia to rectify version 5.